Hi All,
1. how to what is the current line we are executing. List command will display the 10 lines by default.
2. how to put a pointer to the current excuting line when executing the list.
2. if i have set one break point and i want to set 2nd break point do i need to delete the first break... (1 Reply)
Hi everyone im new to this forums, i just wanted to get started by asking a few question(Im a Unix newbie)
1. How do i sort a file called "dirr" in a ascending order on the 3rd column
2. what does alias on=who do
Thanks in advance!!! (1 Reply)
hey all, I have question when am writing simple shell...
in the child am calling execvp, i want the parent to know when execvp returns - 1. how can i let the parent know the result of execvp
thanks in advance (9 Replies)
Hello Guys
I am a complete New bie in UNIX ( Just know a few of the commands ). Please guide how should I learn Unix In a proper way . I am doing a job, so i will have to do the study at home . Which books , Links, Pages you will suggest me so that i can learn UNIX fast .
Thanks (5 Replies)
1.) I am to write scripts that will be phasetest folder in the home directory.
2.) The folder should have a set-up,phase and display files
I have written a small script which i used to check for the existing users and their password.
What I need help with:
I have a set of questions in a... (19 Replies)
from my understanding
step 1:
From device A to device B , sending SYN.
SYN=1
ACK=0
Ackno=0
Sequence number=2000
step 2:
from device B to A , sending SYN-ACK
SYN=1
ACK=1
ACKno=2001
Sequence number= 5000
Step :3 (4 Replies)
Discussion started by: baker
4 Replies
LEARN ABOUT REDHAT
ipcrm
IPCRM(8) Linux Programmer's Manual IPCRM(8)NAME
ipcrm - remove a message queue, semaphore set or shared memory id
SYNOPSIS
ipcrm [ -M key | -m id | -Q key | -q id | -S key | -s id ] ...
deprecated usage
ipcrm [ shm | msg | sem ] id ...
DESCRIPTION
ipcrm removes System V interprocess communication (IPC) objects and associated data structures from the system. In order to delete such
objects, you must be superuser, or the creator or owner of the object.
System V IPC objects are of three types: shared memory, message queues, and semaphores. Deletion of a message queue or semaphore object is
immediate (regardless of whether any process still holds an IPC identifier for the object). A shared memory object is only removed after
all currently attached processes have detached (shmdt(2)) the object from their virtual address space.
Two syntax styles are supported. The old Linux historical syntax specifies a three letter keyword indicating which class of object is to
be deleted, followed by one or more IPC identifiers for objects of this type.
The SUS-compliant syntax allows the specification of zero or more objects of all three types in a single command line, with objects speci-
fied either by key or by identifier. (See below.) Both keys and identifiers may be specified in decimal, hexadecimal (specified with an
initial '0x' or '0X'), or octal (specified with an initial '0').
OPTIONS -M shmkey
removes the shared memory segment created with shmkey after the last detach is performed.
-m shmid
removes the shared memory segment identified by shmid after the last detach is performed.
-Q msgkey
removes the message queue created with msgkey.
-q msgid
removes the message queue identified by msgid.
-S semkey
removes the semaphore created with semkey.
-s semid
removes the semaphore identified by semid.
The details of the removes are described in msgctl(2), shmctl(2), and semctl(2). The identifiers and keys may be found by using ipcs(8).
NOTES
In its first Linux implementation, ipcrm used the deprecated syntax shown in the SYNOPSIS. Functionality present in other *nix implementa-
tions of ipcrm has since been added, namely the ability to delete resources by key (not just identifier), and to respect the same command-
line syntax. For backward compatibility the previous syntax is still supported.
SEE ALSO ipcs(8), msgctl(2), msgget(2), semctl(2), semget(2), shmctl(2), shmdt(2), shmget(2), ftok(3)ipcrm last change: 19 March 2002 IPCRM(8)